Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c76db7df91484…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 23:07:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 77fd0661e5ec0688e26d9be701c5b96c SHA-1: e7257fffe4a543a181b35b64f221a83677b45d33 SHA-256: 1b9c76db7df914847cd0f055ee46672825cdcf2bc9ff760f52a62f7bf0499cdd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" or "free generators" for popular games. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-avatar-for-hackers-game-hack. The document body and embedded URLs suggest a social engineering lure to trick users into visiting these sites, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/roblox-avatar-for-hackers-game-hack In PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/best-parkour-free-run-roblox_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/roblox-badges-hack_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/roblox-hack-tool-account_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/roblox-nike-free-auttaucollant_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/create-free-account-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004eb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB6 23996 bytes
SHA-256: c877ad39a8d4eb51d6bad7f26e77e432092b887d7504236ff7356204e7fc13d9
font_01_sfnt_off00008583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8583 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00008fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA2 18564 bytes
SHA-256: d793df8b249c1427916ed16f34dd8cf95aca6180c5d9ead9614ee38ddf21574a

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